Lukas Concrete crushers - Manual (Page 29)

29
10.2.4 Function and load test
Perform a stress test if there is doubt about safety or reliability.
For the load test, the recycling unit must be surrounded by a sturdy screen. The screen must
be capable of protecting all involved and uninvolved persons from mechanical failure of the
unit during the test. Mechanical failure includes e.g. the fracture of the crusher arm or the
failure of the hose.
In the load test the maximum operating pressure is applied to the Concrete Crusher. The
crusher arms must then be applied by the tips against a min. 30 mm thick block of aluminium.
Load testing:
The following components will be required for the load test:
- a screen. This must be capable of protecting all involved and uninvolved persons
from mechanical failure of the unit during the test. Mechanical failure includes e.g. the
fracture of the crusher arm or the failure of the hose.
- a test pressure gauge for connection to the hydraulic lines (pressure range at least up
to the maximum operating pressure of the hydraulic source)
- a block of aluminium at least 50 x 50 x 30 mm in size
- an appropriate crack testing kit
Carrying out the load test:
1. Connect the test pressure gauge between the Concrete Crusher and the hose to the
hydraulic source. The pressure gauge must be capable of measuring the pressure in
the pressure line
2. Place the unit under the screen so that you can operate the unit and read the value on
the pressure gauge. In addition, it must be screened so that nobody will be at risk if the
unit suffers mechanical failure.
3. Start the hydraulic supply of the recycling unit.
4. Open the unit by approx. 60 mm.
5. Place the block of aluminium between the tips of the crusher arms.
6. Now you can start the test. Close the crusher arms so that the tips press into the
aluminium block. Keep holding the star grip on the unit in position to close the unit.
7. After approx. 30 seconds, read off the value on the test pressure gauge and release
the star grip. The value read off on the test pressure gauge must correspond to the
maximum operating pressure of the hydraulic source. A deviation of 10 % is acceptable.
8. Open the crusher arms again so that you can remove the block of aluminium.
9. Then carry out a crack test on the crusher arms.
If the unit has passed these tests, then it is in order.